--- ./mythphone/dtmffilter.cpp.orig	2005-03-13 20:05:49.000000000 +0100
+++ ./mythphone/dtmffilter.cpp	2005-03-13 20:06:17.000000000 +0100
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <iostream>
+#include <math.h>
 
 using namespace std;